四边形有四条直的边，有四个角．______．（判断对错）
四边形有四条直的边，有四个角，说法正确，
故答案为：√．
— What do you think about _________ dress in the shop window?
— Oh, it’s beautiful. You may give it to Linda as _________ birthday present.
A．a; a
B．the; a
C．a; the
D．the; the
制冷系统在正常运行工况条件下，冷媒水突然中断供应，应首先（）。
